Universität zu Köln

Crockett, Nathan R., Bergin, Edwin A., Neill, Justin L., Favre, Cecile, Schilke, Peter ORCID: 0000-0003-2141-5689, Lis, Dariusz C., Bell, Tom A., Blake, Geoffrey, Cernicharo, Jose ORCID: 0000-0002-3518-2524, Emprechtinger, Martin, Esplugues, Gisela B., Gupta, Harshal, Kleshcheva, Maria, Lord, Steven, Marcelino, Nuria ORCID: 0000-0001-7236-4047, McGuire, Brett A., Pearson, John, Phillips, Thomas G., Plume, Rene ORCID: 0000-0002-6482-8945, van der Tak, Floris, Tercero, Belen and Yu, Shanshan ORCID: 0000-0002-2472-7998 (2014). HERSCHEL OBSERVATIONS OF EXTRAORDINARY SOURCES: ANALYSIS OF THE HIFI 1.2 THz WIDE SPECTRAL SURVEY TOWARD ORION KL. I. METHODS. Astrophys. J., 787 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present a comprehensive analysis of a broadband spectral line survey of the Orion Kleinmann-Low nebula (Orion KL), one of the most chemically rich regions in the Galaxy, using the HIFI instrument on board the Herschel Space Observatory. This survey spans a frequency range from 480 to 1907 GHz at a resolution of 1.1 MHz. These observations thus encompass the largest spectral coverage ever obtained toward this high-mass star-forming region in the submillimeter with high spectral resolution and include frequencies > 1 THz, where the Earth's atmosphere prevents observations from the ground. In all, we detect emission from 39 molecules (79 isotopologues). Combining this data set with ground-based millimeter spectroscopy obtained with the IRAM 30 m telescope, we model the molecular emission from the millimeter to the far-IR using the XCLASS program, which assumes local thermodynamic equilibrium (LTE). Several molecules are also modeled with the MADEX non-LTE code. Because of the wide frequency coverage, our models are constrained by transitions over an unprecedented range in excitation energy. A reduced chi(2) analysis indicates that models for most species reproduce the observed emission well. In particular, most complex organics are well fit by LTE implying gas densities are high (> 10(6) cm(-3)) and excitation temperatures and column densities are well constrained. Molecular abundances are computed using H-2 column densities also derived from the HIFI survey. The distribution of rotation temperatures, T-rot, for molecules detected toward the hot core is significantly wider than the compact ridge, plateau, and extended ridge T-rot distributions, indicating the hot core has the most complex thermal structure.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Crockett, Nathan R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bergin, Edwin A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Neill, Justin L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Favre, Cecile UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, Peter UNSPECIFIED orcid.org/0000-0003-2141-5689 UNSPECIFIED Lis, Dariusz C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bell, Tom A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Blake, Geoffrey UNSPECIFIED UNSPECIFIED UNSPECIFIED Cernicharo, Jose UNSPECIFIED orcid.org/0000-0002-3518-2524 UNSPECIFIED Emprechtinger, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Esplugues, Gisela B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gupta, Harshal UNSPECIFIED UNSPECIFIED UNSPECIFIED Kleshcheva, Maria UNSPECIFIED UNSPECIFIED UNSPECIFIED Lord, Steven UNSPECIFIED UNSPECIFIED UNSPECIFIED Marcelino, Nuria UNSPECIFIED orcid.org/0000-0001-7236-4047 UNSPECIFIED McGuire, Brett A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pearson, John UNSPECIFIED UNSPECIFIED UNSPECIFIED Phillips, Thomas G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Plume, Rene UNSPECIFIED orcid.org/0000-0002-6482-8945 UNSPECIFIED van der Tak, Floris UNSPECIFIED UNSPECIFIED UNSPECIFIED Tercero, Belen UNSPECIFIED UNSPECIFIED UNSPECIFIED Yu, Shanshan UNSPECIFIED orcid.org/0000-0002-2472-7998 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-437122
DOI:	10.1088/0004-637X/787/2/112
Journal or Publication Title:	Astrophys. J.
Volume:	787
Number:	2
Date:	2014
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULAR LINE SURVEY; KLEINMANN-LOW NEBULA; STAR-FORMING REGION; LIMITED MILLIMETER SURVEY; RADIO-SOURCE-I; SUBMILLIMETER ARRAY; SOURCES HEXOS; APERTURE SYNTHESIS; HOT CORE; INTERSTELLAR-MOLECULES Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/43712